Comment 0 for bug 1923670

When booting 5.4.0-71-generic I can not access DFS entries anymore, with 5.4.0-70-generic this still works. Some details:

fstab entry:

//example.com/public /home/user/remote cifs noauto,vers=default,noserverino,users,_netdev,user=remote_user,domain=example.com 0 0

shell session
~$ mount /home/user/remote
Password for remote_user@//example.com/public:
~$ ls /home/user/remote/dfs-folder
dfs-subfolder dfs-entry
~$ ls /home/user/remote/dfs-folder/dfs-entry
ls: cannot access '/home/user/remote/dfs-folder/dfs-entry': No such file or directory

dmesg excerpt
[ 1219.568778] CIFS: Attempting to mount //DC01.example.com/Public/dfs-folder/dfs-entry
[ 1219.584975] FS-Cache: Duplicate cookie detected
[ 1219.584986] FS-Cache: O-cookie c=000000006e995395 [p=00000000f4725c61 fl=222 nc=0 na=1]
[ 1219.584990] FS-Cache: O-cookie d=00000000a11c1428 n=0000000071ab21ba
[ 1219.584993] FS-Cache: O-key=[6] '5075626c6963'
[ 1219.585001] FS-Cache: N-cookie c=00000000a0608786 [p=00000000f4725c61 fl=2 nc=0 na=1]
[ 1219.585004] FS-Cache: N-cookie d=00000000a11c1428 n=00000000901f6a53
[ 1219.585007] FS-Cache: N-key=[6] '5075626c6963'
[ 1219.725834] FS-Cache: Duplicate cookie detected
[ 1219.725847] FS-Cache: O-cookie c=000000006e995395 [p=00000000f4725c61 fl=222 nc=0 na=1]
[ 1219.725851] FS-Cache: O-cookie d=00000000a11c1428 n=0000000071ab21ba
[ 1219.725854] FS-Cache: O-key=[6] '5075626c6963'
[ 1219.725864] FS-Cache: N-cookie c=000000000509709f [p=00000000f4725c61 fl=2 nc=0 na=1]
[ 1219.725868] FS-Cache: N-cookie d=00000000a11c1428 n=00000000556f158b
[ 1219.725870] FS-Cache: N-key=[6] '5075626c6963'
[ 1220.216524] CIFS VFS: cifs_read_super: get root inode failed

The dmesg from 5.4.0-70-generic does not have the line
CIFS VFS: cifs_read_super: get root inode failed

~$ lsb_release -rd
Description: KDE neon User Edition 5.21
Release: ~$ lsb_release -rd
Description: KDE neon User Edition 5.21
Release: 20.04
     20.04
~$ apt-cache policy linux-image-generic
linux-image-generic:
  Installed: 5.4.0.71.74
  Candidate: 5.4.0.71.74
  Version table:
 *** 5.4.0.71.74 500
        500 http://de.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
     5.4.0.26.32 500
        500 http://de.archive.ubuntu.com/ubuntu focal/main amd64 Packages